Any_vertex {

  void display() to * (DisplayVisitor);

  void print() to * (PrintVisitor);

}

Any_vertex_List {
  
  void display() to * (DisplayVisitor);

  void print() to * (PrintVisitor);

}

Adjacency {
   
  void print() to * (PrintVisitor);
 
}

FlattenVisitor {
{{
   private Neighbors trueId;   
   void before (Adjacency host) {      
      trueId = host.get_ns();      
      if (trueId instanceof Construct_ns) {
//      System.out.println("This is a Construct_ns object");
        Set cycle_set = new HashSet();
        Adjacency temp_parent = host.get_myparent();
        while (temp_parent != null) {
//           temp_parent.print();
           if (temp_parent == host || cycle_set.contains(temp_parent)) break;
//         System.out.println(temp_parent.get_source().get_vertex_name());
           cycle_set.add(temp_parent);
           Any_vertex_List cp_list = temp_parent.get_common_parts();
           Enumeration listPointer = cp_list.elements();
           Any_vertex_List avl = host.get_construct_part();
              while (listPointer.hasMoreElements()) {
//                 avl.print();
//                 cp_list.print();
                 avl.addElement((Any_vertex) listPointer.nextElement());
              }          
           temp_parent = temp_parent.get_myparent();
        }
      }
/*
      if (trueId instanceof Alternat_ns) {
         System.out.println("This is an Alternat_ns object");
      }
*/
   }
}}
}

RemoveCommonVisitor {

  before Adjacency {{
    host.remove_common_parts();
  }}

}

Adjacency {

  Any_vertex_List get_common_parts() to Alternat_ns {
    
    {{ Any_vertex_List common_parts; }}
    
    init {{ 
      common_parts = new Any_vertex_List(); 
    }}
    
    before Alternat_ns {{ 
      common_parts = host.get_construct_ns(); 
    }}
  
    after Adjacency {{ 
      return_val = common_parts; 
    }}
  
  }

  void remove_common_parts() to Alternat_ns {
   
    before Alternat_ns {{
      host.get_construct_ns().set_first(null);
    }}
  
  }
 
  Any_vertex_List get_construct_part() to Any_vertex_List {
    
    before Any_vertex_List {{ 
      return_val = host;
    }}
  
  }

}